Improving the autonomy of islanded microgrids through frequency regulation

Rodrigues, Yuri R.; Monteiro, Maíra R.; Abdelaziz, Morad; Wang, Liwei; Souza, Arthur; Ribeiro, Paulo F.

doi:10.1016/j.ijepes.2019.105499

Cited by 20 publications

(9 citation statements)

References 19 publications

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“…Expressions describing the dynamics of three-phase currents in an abc coordinate system in continuous-time state space equations are as in (7) and the intermediate steps come out in (3) through (6).…”

Section: Grid-forming Inverter (4 Legs)mentioning

confidence: 99%

“…Controls that were previously maintained at the transmission level during abnormal circumstances, such as failures in the main network and scheduled maintenance can now be performed locally. The islanded microgrid concept makes it suitable to be installed in remote regions, in areas where connection to the grid is not advantageous and to increase the system reliability [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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An application of four‐wire grid‐forming power inverter in unbalanced distribution network

Döhler

Mota

Archetti

et al. 2022

IET Generation Trans & Dist

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The modelling of a three‐phase four‐leg four‐wire grid‐forming inverter in a low voltage distribution system 18‐bus European Cigré under unbalanced conditions in an autonomous distribution network is presented. The case study has two types of inverters control strategy: (i) grid‐forming to supply all the system demand in the interval of the intentional supply interruption and (ii) grid‐following to integrate photovoltaic renewable energy resources into power systems. The model suggests a control scheme with two loops: An inner current loop with a proportional‐integral controller and an outer voltage loop with a proportional controller, both in the synchronous reference frame (dq0), in which dq‐axis are decomposed in positive and negative sequences. Simulation results, carried out using the PSCAD software, showed the effectiveness of the suggested control strategy with smooth synchronization where the grid‐forming inverter was able to form a network with an unbalanced degree lower than 2%, sinusoidal voltage and frequency within standard limits 49.5–50.5 Hz.

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Section: Grid-forming Inverter (4 Legs)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An application of four‐wire grid‐forming power inverter in unbalanced distribution network

Döhler

Mota

Archetti

et al. 2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…This is an evolving issue, and current distribution systems are not necessarily equipped to properly support system frequency, but depend on the interconnected system for load-generation balance (Bollen et al, 2017b). Studies such as Rodrigues et al (2020) propose a novel frequency control, that allows the frequency setpoint to change adaptively throughout the evolution of the microgrid's islanded operation.…”

Section: Frequency Variationsmentioning

confidence: 99%

Power Quality in AC Islanded Microgrids: Technical Framework and State of the Art Review

et al. 2020

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In recent years, operation and control strategies in distribution systems have changed due to the increase in the connection of distributed generation sources (DGs). Small local networks with electricity users and DGs are known as microgrids. These microgrids can operate independently (islanded) or in collaboration (interconnected) with the main network or other microgrids. Some advantages of interconnected microgrids include the reduction of losses, an increase in reliability, and decentralized operation under fault conditions. Nevertheless, when a microgrid operates in islanded mode, its electrical characteristics change and, consequently, the severity of power quality disturbances can increase, as well as their negative impact on electronic devices (loads and DG devices). This paper presents a comprehensive literature review of existing studies on power quality disturbances in islanded microgrids and identifies the most relevant needs for future research on this topic. Detailed information is analyzed to compare the differences between disturbance levels in both interconnected and islanded microgrids. In the case of harmonic disturbances, the impact of the different microgrid configurations is also analyzed.

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“…A two-stage solution method was proposed to determine the division and removal of load, and the load priority and controllability were considered. In Rodrigues et al (2020), it was studied that, in the case of MG fault, the longest operation time of island MG is the goal to improve the autonomy of island MG. The longest operation time meant that the satisfaction of MG needed to be sacrificed.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Optimal Scheduling of Multi-Microgrids Considering Renewable Energy Intermittency

Wang

2022

Front. Energy Res.

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Accelerating the penetration of renewable energy (RE) in energy consumption is an important method to realize the promotion of CO2 emission peaking and carbon neutrality. The energy transaction between two microgrids (MGs) makes up for the limitations that a single MG cannot deal well with the intermittence and fluctuation of RE in the real-time scheduling of the system. Multi-microgrids (MMGs) composed of multiple MGs have become an effective supplement to China’s power system. However, extreme weather and natural disasters can easily cause fault shutdown of wind turbines (WTs) and photovoltaics (PVs) in the microgrid (MG). To better balance the flexible load curtailment and satisfaction of MMGs, this paper proposes a coordinated scheduling model for MMGs. This model covers the WT, the PV, the fuel cell (FC), the energy storage system (ESS), and flexible load curtailment. First, the energy management system (EMS) of MMGs collects information on all the distributed generators’ output and three types of loads. The contribution bargaining game is applied to realize the energy transaction between each two MGs. Second, balancing multi-microgrid satisfaction and the profit of each MG is taken as the objective function, and the scheduling strategy of each MG is formulated. Also, an improved optimization method is applied to solve the amount of flexible load curtailment of each MG and realize the reasonable scheduling of MMG in the fault state. In the case study, the superiority of the model and the proposed method has been verified.

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Improving the autonomy of islanded microgrids through frequency regulation

Cited by 20 publications

References 19 publications

An application of four‐wire grid‐forming power inverter in unbalanced distribution network

An application of four‐wire grid‐forming power inverter in unbalanced distribution network

Power Quality in AC Islanded Microgrids: Technical Framework and State of the Art Review

Real-Time Optimal Scheduling of Multi-Microgrids Considering Renewable Energy Intermittency

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